| P&A | Parts and Accessories 
| Others |
| P&A | Percussion and Auscultation
| Others |
| P&A | Personnel and Administration
| Others |
| P&A | Pierre and Anatole
| Others |
| P&A | Pierre and Andrey
| Others |
| P&A | Polyester et Accesoires
| Others |
| P.A. | Prince Albert
| Others |
| P/A | Presence/Absence
| Others |
| P/A | Problem Analysis
| Others |
| PA | IEEE Donald O. Pederson Award in Solid-State Circuits
| Others |
| PA | PA Abbreviation
| Others |
| PA | Pad Abort
| Others |
| PA | Paging and Area Warning
| Others |
| PA | Pakistan Army
| Others |
| PA | Palaeontological Association
| Others |
| PA | Palaeopathology Association
| Others |
| PA | Palermo (Provence)
| Others |
| PA | Palestinian Assassins
| Others |
| PA | Palestinian Authority
| Others |
| PA | Palm Avenue
| Others |
| PA | Palo Alto, California
| Others |
| PA | Pan American World Airways
| Others |
| PA | Panama According
| Others |
| PA | Panic Attack
| Others |
| PA | Panties Anonymous
| Others |
| PA | Papa A
| Others |
| PA | Papers Applied
| Others |
| PA | Papers submitted (e.g., naturalization papers)
| Others |
| PA | Para Again
| Others |
| PA | Parameters Avf
| Others |
| PA | paranoia
| Others |
| PA | Paranoids Anonymous
| Others |
| PA | Paranormal Activities
| Others |
| PA | Parapsychological Association
| Others |
| PA | Parent Relay
| Others |
| PA | Parental Advisory
| Others |
| PA | Parents' Association
| Others |
| PA | Park Avenue
| Others |
| PA | Partial Accreditation
| Others |
| PA | Partially Apply
| Others |
| PA | Partially Assembled
| Others |
| PA | Partibus Affectis
| Others |
| pa | Partibus Affectis To the affected parts
| Others |
| PA | Partido Andalucista
| Others |
| Pa | Pascal
| Others |
| PA | Pascals A
| Others |
| PA | Passenger Address
| Others |
| PA | Passive Aggressive
| Others |
| PA | Past Action
| Others |
| PA | Patent Act
| Others |
| PA | Path Aux
| Others |
| PA | Pathetic Australian
| Others |
| PA | patient
| Others |
| PA | Pay Addtionaly
| Others |
| PA | Pay Attention
| Others |
| PA | Payment Authorization
| Others |
| PA | Peace Action
| Others |
| PA | Peano Arithmetic
| Others |
| PA | Peep Abuse
| Others |
| PA | Penalty Assessment
| Others |
| PA | Penelope Anyway
| Others |
| PA | Pennsylvania
| State |
| PA | Pennsylvania also
| Others |
| PA | Penny Arcade
| Others |
| PA | Pension Adjustment
| Others |
| PA | People Authority
| Others |
| PA | People's Association
| Others |
| pa | Per annum
| Others |
| PA | Percussion & Auscultation
| Others |
| PA | Perfect A**
| Others |
| PA | Perfect Attack
| Others |
| PA | Perfect Attendance
| Others |
| PA | Perfectly Airconditioned
| Others |
| PA | Performance Accountability
| Others |
| PA | Performance Analysis
| Others |
| PA | Performance Artist
| Others |
| PA | Performance Assertion
| Others |
| PA | Performance Assessment
| Others |
| PA | Performance Audio
| Others |
| PA | Performing Artist
| Others |
| PA | Performing Arts
| Others |
| PA | periarteritis
| Others |
| PA | Periodic Acid
| Others |
| PA | Pernicious Anaemia
| Others |
| PA | Pernicious Anemia
| Others |
| PA | Persistent Attribute
| Others |
| PA | Personal Accident
| Others |
| PA | Personal Advisor
| Others |
| PA | Personal Appearence
| Others |
| PA | Personal Assassin
| Others |
| PA | Personal Assistant
| Others |
| PA | Personal Author
| Others |
| PA | Personal Authority
| Others |
| PA | Personnel Administration
| Others |
| PA | Philippine Army
| Others |
| PA | Phillips Academy
| Others |
| PA | Phonemic Awareness
| Others |
| PA | Phosphatidic Acid
| Others |
| PA | photoallergic
| Others |
| PA | Physical Ability
| Others |
| PA | Physical Activity
| Others |
| PA | Physical Address
| Others |
| PA | Physical Affair
| Others |
| PA | Physical Agents
| Others |
| PA | Physical Aptitude
| Others |
| PA | Physician Advisor
| Others |
| PA | Physician Assistant
| Others |
| PA | Physician Assistants
| Others |
| PA | Physician's Assistant
| Others |
| PA | Physiological Anthropology
| Others |
| PA | Piong Astro
| Others |
| PA | Piper Aircraft
| Others |
| PA | Plasminogen Activator
| Others |
| PA | Plate appearance
| Others |
| PA | Plate Appearances
| Others |
| PA | Platelet Adhesiveness
| Others |
| PA | Platform Analytics
| Others |
| PA | Play Action
| Others |
| PA | Player Association
| Others |
| PA | Playoff Appearances
| Others |
| PA | Pointer Adjustment
| Others |
| PA | Points Against
| Others |
| PA | Pokey Award
| Others |
| PA | Polar Accelerometer
| Others |
| PA | Polar Angle
| Others |
| PA | Police Advisor
| Others |
| PA | Police Authority (!)
| Others |
| PA | Political Awareness
| Others |
| PA | PolyAmide (Nylon)
| Others |
| PA | polyarteritis
| Others |
| PA | Pop Art
| Others |
| PA | Port Adapter
| Others |
| PA | Port Angeles
| Others |
| PA | Port Authority
| Others |
| PA | Portfolio Artifact
| Others |
| PA | Position Angle
| Others |
| PA | Position Approximate
| Others |
| PA | Positive Affect
| Others |
| PA | Positive Attitude
| Others |
| PA | Post Apocalypse
| Others |
| PA | Post Apocalyptic
| Others |
| PA | Post Auctor
| Others |
| PA | Postero-Anterior
| Others |
| PA | Potentially Annoying
| Others |
| PA | Power Adapter
| Others |
| PA | Power Amplifier
| Others |
| PA | Powered Armor
| Others |
| PA | Practice Assurance
| Others |
| PA | Pre Active
| Others |
| PA | Pre Alpine
| Others |
| PA | Pre Approved
| Others |
| PA | prealbumin
| Others |
| PA | Precautionary Approach
| Others |
| PA | Precision Architecture
| Others |
| PA | Prefectural Advisor
| Others |
| PA | Pregnancy-Associated
| Others |
| PA | Preppie Anarchist
| Others |
| PA | Presence Agent
| Others |
| PA | Presenetljiva Agencija
| Others |
| PA | Press Association
| Others |
| PA | Pressure Assist (For toilets)
| Others |
| PA | Pressure in the Atmosphere
| Others |
| PA | Pretty Average
| Others |
| PA | Prevention Advocate
| Others |
| PA | Primary Agency
| Others |
| PA | Principal Applicant
| Others |
| PA | Printable ASCII
| Others |
| PA | Prior Authorization
| Others |
| PA | Prismatic And
| Others |
| PA | Privacy Act
| Others |
| PA | Privacy Act of 1974
| Others |
| PA | Private Action
| Others |
| PA | Private Actress
| Others |
| PA | Pro Audio
| Others |
| PA | Probability of Arrival
| Others |
| PA | ProcainAmide
| Others |
| PA | Process Algebra
| Others |
| PA | Process Automation
| Others |
| PA | Process the Acronym
| Others |
| PA | Processing Activities
| Others |
| PA | Procrastinators Anonymous
| Others |
| PA | Procurement Administrator
| Others |
| PA | Procurement Army
| Others |
| PA | Product Area
| Others |
| PA | Product Assurance
| Others |
| PA | Production Assistant
| Others |
| PA | Professional Association
| Others |
| PA | Profile Analysis
| Others |
| PA | Program Advance
| Others |
| PA | Program Announcement
| Others |
| PA | Program Assistant
| Others |
| PA | Programmed Activity
| Others |
| PA | Project A
| Others |
| PA | Project Administrator
| Others |
| PA | Project Airbus
| Others |
| PA | Prophylactic Antibiotic
| Others |
| PA | Propionic Acidemia
| Others |
| PA | Proscenium Arch
| Others |
| PA | Prosser Ambassador
| Others |
| PA | Prostitutes Anonymous
| Others |
| PA | Protactinium
| Element |
| PA | Proton Affinity
| Others |
| PA | Protrusio Acetabuli
| Others |
| PA | Provider Aggregatable
| Others |
| PA | Provider Assigned
| Others |
| PA | pseudoaneurysm
| Others |
| PA | Psoriasis Association
| Others |
| PA | psychoanalyst
| Others |
| PA | Psychological Age
| Others |
| PA | Psychological Associate
| Others |
| PA | Psychology Annex
| Others |
| PA | Public Accountant
| Others |
| PA | Public Act
| Others |
| PA | Public Address
| Others |
| PA | Public Address system
| Others |
| PA | Public Administration
| Others |
| PA | Public Affairs
| Others |
| PA | Public Announcement
| Others |
| PA | Pulmonary Angiography
| Others |
| PA | Pulmonary Artery
| Others |
| PA | Pulmonary Atresia
| Others |
| PA | pulpoaxial
| Others |
| PA | Pulse Amplifier
| Others |
| PA | Pulse Arc welder
| Others |
| PA | Pumpkin Ath
| Others |
| PA | Punjabi
| Others |
| PA | Punta Arenas
| Others |
| PA | Purchasing Agent
| Others |
| PA | Purple Amp
| Others |
| PA | Push America
| Others |